Helium

- Liquid helium is used as cryogenic agent [4, 8], e.g. for the electromagnets used for MRI [8].
- Used for balloons and airships [4, 8]
- Helium is commonly used as the mobile gas phase for gas chromatography [8].
- Helium is used helium:neon lasers and helium:cadmium lasers [8].
- Q-Gas, a mixture of 98.7 % He and 1.3 % butane (v/v), is used as a filling for gas-flow Geiger counters [4]
- Mixtures of oxygen and helium is used to improve breathing for persons with obstructed airways [8]
- Helium is used to improve breathing for divers and the prevention of nitrogen narcosis and decompression sickness [8]